Home » Classification Of NDT Methods

Classification Of NDT Test Methods

Nondestructive techniques are the means by which materials and structures may be inspected without disruption or impairment of serviceability. The science of nondestructive testing incorporates all the technology for detection and measurement of significant properties, including discontinuities, in items ranging from research specimen to finished hardware and products.

Nondestructive testing has become a progressively more fundamental factor in the effective conduct of research, development, design and manufacturing programs. However, the information required for appreciating the broad scope of nondestructive testing is widely scattered in a multitude of publications and reports.

The National Materials Advisory Board (NMAB) Ad Hoc Committee on Nondestructive Evaluation adopted a system that classified methods into six major categories: visual, penetrating radiation, magnetic-electrical, mechanical vibration, thermal and chemical- electrochemical.

Nondestructive Testing Method Categories

Ndt Testing Services
Basic Categories Objectives
Mechanical and optical color, cracks, dimensions, film thickness, gaging, reflectivity, strain distribution and magnitude, surface finish, surface flaws, through-cracks
Penetrating radiation cracks, density and chemistry variations, elemental distribution, foreign objects, inclusions, microporosity, misalignment, missing parts, segregation, service degradation, shrinkage, thickness, voids
Electromagnetic and electronic alloy content, anisotropy, cavities, cold work, local strain, hardness, composition, contamination, corrosion, cracks, crack depth, crystal structure, electrical and thermal conductivities, flakes, heat treatment, hot tears, inclusions, ion concentrations, laps, lattice strain, layer thickness, moisture content, polarization, seams, segregation, shrinkage, state of cure, tensile strength, thickness, disbonds
Sonic and ultrasonic crack initiation and propagation, cracks, voids, damping factor, degree of cure, degree of impregnation, degree of sintering, delaminations, density, dimensions, elastic moduli, grain size, inclusions, mechanical degradation, misalignment, porosity, radiation degradation, structure of composites, surface stress, tensile, shear and compressive strength, disbonds, wear
Thermal and infrared bonding, composition, emissivity, heat contours, plating thickness, porosity, reflectivity, stress, thermal conductivity, thickness, voids
Chemical and analytical alloy identification, composition, cracks, elemental analysis and distribution, grain size, inclusions, macrostructure, porosity, segregation, surface anomalies

Auxiliary Categories Objectives
Image generation dimensional variations, dynamic performance, anomaly characterization and definition, anomaly distribution, anomaly propagation, magnetic field configurations
Signal image analysis data selection, processing and display, anomaly mapping, correlation and identification, image enhancement, separation of multiple variables, signature analysis
Ndt Testing Of Concrete

Ultrasonic Investigation Visual Inspection Portable Hardness
Dye Penetration Core Cutting Rebound Hammer